binutils-gdb/bfd/coff-mips.c

/* MIPS Extended-Coff handler for Binary File Diddling.
   Written by Per Bothner.  */

/* Copyright (C) 1990, 1991 Free Software Foundation, Inc.

This file is part of BFD, the Binary File Diddler.

BFD is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.

BFD is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with BFD; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */

/* This does not compile on anything but a MIPS yet (and I haven't been
   able to test it there either since the latest merge!).  So it stays
   out by default.  */

#define MIPS 1
#include <stdio.h>
#include <string.h>

#include "bfd.h"
#include "libbfd.h"
#include "sysdep.h"

#include "intel-coff.h"
#include "libcoff.h"		/* to allow easier abstraction-breaking */

/* initialize a section structure with information
 * peculiar to this particular implementation of coff 
 */

static boolean
ecoff_new_section_hook(ignore_abfd, ignore)
bfd *ignore_abfd;
asection *ignore;
{
    return true;
}

/* Take a section header read from a coff file (in HOST byte order),
   and make a BFD "section" out of it.  */
static          boolean
DEFUN(make_a_section_from_file,(abfd, hdr),
      bfd            *abfd AND
      struct scnhdr  *hdr)
{
    asection       *return_section;

    {
	/* Assorted wastage to null-terminate the name, thanks AT&T! */
	char *name = bfd_alloc(abfd, sizeof (hdr->s_name)+1);
	if (name == NULL) {
	    bfd_error = no_memory;
	    return false;
	}
	strncpy(name, (char *) &hdr->s_name[0], sizeof (hdr->s_name));
	name[sizeof (hdr->s_name)] = 0;

	return_section = bfd_make_section(abfd, name);
    }

    /* s_paddr is presumed to be = to s_vaddr */
#define assign(to, from) return_section->to = hdr->from
    assign(vma, s_vaddr);
    /* assign (vma, s_vaddr); */
    assign(size, s_size);
    assign(filepos, s_scnptr);
    assign(rel_filepos, s_relptr);
    assign(reloc_count, s_nreloc);
    assign(line_filepos, s_lnnoptr);
    /*
       return_section->linesize =   hdr->s_nlnno * sizeof (struct lineno);
    */

#undef assign
    return_section->lineno_count = hdr->s_nlnno;
    return_section->userdata = NULL;
    return_section->next = (asection *) NULL;
    if ((hdr->s_flags & STYP_TEXT) || (hdr->s_flags & STYP_DATA))
	return_section->flags = (SEC_LOAD | SEC_ALLOC);
    else if (hdr->s_flags & STYP_BSS)
	return_section->flags = SEC_ALLOC;

    if (hdr->s_nreloc != 0)
	return_section->flags |= SEC_RELOC;
    if (hdr->s_scnptr != 0)
	return_section->flags |= SEC_HAS_CONTENTS;
    return true;
}

bfd_target *
ecoff_real_object_p (abfd, nscns, opthdr)
     bfd *abfd;
     unsigned short nscns, opthdr;
{
  struct icofdata *tdata;
  char *file_info;		/* buffer for all the headers */
  long readsize;		/* length of file_info */
  struct filehdr* filehdr;	/* points into file_info */
  struct scnhdr *sections;	/* points into file_info */

  /* OK, now we know the format, read in the filehdr, soi-disant
     "optional header", and all the sections.*/
  readsize = sizeof(struct filehdr) + opthdr + (nscns * sizeof (struct scnhdr));
  file_info = (char*)bfd_alloc (abfd, readsize);
  if (file_info == NULL) {
    bfd_error = no_memory;
    return 0;
  }
  if (bfd_seek (abfd, 0, false) < 0) return 0;
  if (bfd_read (file_info, 1, readsize, abfd) != readsize) return 0;
  filehdr = (struct filehdr *) file_info;
  sections = (struct scnhdr *) (file_info + sizeof (struct filehdr) + opthdr);

  /* Now copy data as required; construct all asections etc */
  tdata = (struct icofdata *) bfd_zalloc (abfd, sizeof (struct icofdata) +
				                sizeof (AOUTHDR));
  if (tdata == NULL) {
    bfd_release (abfd, file_info);
    bfd_error = no_memory;
    return 0;
  }

  if (nscns != 0) 
  {
    unsigned int i;
    for (i = 0; i < nscns; i++) 
      {
	make_a_section_from_file (abfd, sections + i);
      }
  }

  abfd->flags |= HAS_RELOC | HAS_LINENO | HAS_LOCALS;

  /* FIXME, the guess should be set by OR-ing info from the sections */
  if ((filehdr->f_flags & F_RELFLG) != F_RELFLG) abfd->flags &= ~HAS_RELOC;
  if ((filehdr->f_flags & F_EXEC) == F_EXEC)     abfd->flags |= EXEC_P;
  if ((filehdr->f_flags & F_LNNO) != F_LNNO)     abfd->flags &= ~HAS_LINENO;
  if ((filehdr->f_flags & F_LSYMS) != F_LSYMS)   abfd->flags &= ~HAS_LOCALS;
  set_tdata (abfd, tdata);
  bfd_get_symcount (abfd) = filehdr->f_nsyms;
  if (filehdr->f_nsyms) abfd->flags |= HAS_SYMS;
   
  tdata->sym_filepos = filehdr->f_symptr;
/* FIXME, needs byte swapping */
  tdata->hdr = *(struct aouthdr *)(file_info + sizeof (struct filehdr));
  tdata->symbols = (coff_symbol_type *)NULL;
  bfd_get_start_address (abfd) = exec_hdr (abfd).entry;
  return abfd->xvec;
}

bfd_target *
ecoff_object_p (abfd)
     bfd *abfd;
{
  unsigned char short_bytes[SHORT_SIZE];
  unsigned short magic, nscns, opthdr;

  bfd_error = no_error;

  /* figure out how much to read */
  if (bfd_read ((PTR)short_bytes, 1, SHORT_SIZE, abfd) != SHORT_SIZE)
    return 0;

  magic = bfd_h_getshort (abfd, short_bytes);
  if (magic != (abfd->xvec->byteorder_big_p ? 0x160 :  0x162)) {
    bfd_error = wrong_format;
    return 0;
  }
  if (bfd_read ((PTR)short_bytes, 1, SHORT_SIZE, abfd) != SHORT_SIZE)
    return 0;
  nscns = bfd_h_getshort (abfd, short_bytes);

  if (bfd_seek (abfd,(file_ptr) ((sizeof (long)) * 3), true) < 0) 
    return 0;
  if (bfd_read ((PTR)short_bytes, 1, SHORT_SIZE, abfd) != SHORT_SIZE)
    return 0;
  opthdr = bfd_h_getshort (abfd, short_bytes);

  return ecoff_real_object_p (abfd, nscns, opthdr);
}

static boolean
ecoff_mkobject (abfd)
     bfd *abfd;
{
  char *rawptr;


  bfd_error = no_error;

  /* Use an intermediate variable for clarity */
  rawptr = (char*)bfd_zalloc (abfd, sizeof (struct icofdata));
  if (rawptr == NULL) {
    bfd_error = no_memory;
    return false;
  }
  set_tdata (abfd, rawptr);
  return true;
}

void
ecoff_write_linenumbers(ignore_abfd)
bfd *ignore_abfd;
{
}


static asymbol *
ecoff_make_empty_symbol(abfd)
    bfd            *abfd;
{
    coff_symbol_type *new = (coff_symbol_type *) bfd_alloc(abfd, sizeof(coff_symbol_type));
    if (new == NULL) {
	bfd_error = no_memory;
	return (NULL);
    }				/* on error */
    new->native = 0;
    new->lineno = (alent *) NULL;
    new->symbol.the_bfd = abfd;
    return &new->symbol;
}

/*SUPPRESS 558*/
/*SUPPRESS 529*/
boolean
ecoff_write_object_contents (ignore_abfd)
     bfd *ignore_abfd;
{
  return false;
}

/* Calculate the file position for each section. */
/* ARGSUSED */
boolean
ecoff_set_section_contents (abfd, section, location, offset, count)
     bfd *abfd;
     sec_ptr section;
     unsigned char *location;
     file_ptr offset;
      int count;
{
    return false;
}

/* ARGSUSED */
boolean
ecoff_set_section_linenos (abfd, section, location, offset, count)
     bfd *abfd;
     sec_ptr section;
     unsigned char *location;
     file_ptr offset;
      int count;
{
   return 0;
}

/* ARGSUSED */
static boolean
ecoff_slurp_symbol_table(abfd)
     bfd *abfd;
{
    abort();
}

unsigned int
ecoff_get_symtab_upper_bound (abfd)
     bfd *abfd;
{
  if (!ecoff_slurp_symbol_table (abfd)) return 0;

  return (bfd_get_symcount (abfd)+1) * (sizeof (coff_symbol_type *));
}


unsigned int
ecoff_get_symtab(abfd, alocation)
bfd *abfd;
asymbol **alocation;
{
  unsigned int counter = 0;
  coff_symbol_type *symbase;
  coff_symbol_type **location = (coff_symbol_type **)(alocation);

  if (!ecoff_slurp_symbol_table (abfd)) return 0;

  for (symbase = obj_symbols (abfd); counter++ < bfd_get_symcount (abfd);)
    *(location++) = symbase++;
  *location++ =0;
  return counter;
}

unsigned int
ecoff_get_reloc_upper_bound (abfd, asect)
     bfd *abfd;
     sec_ptr asect;
{
  if (bfd_get_format (abfd) != bfd_object) {
    bfd_error = invalid_operation;
    return 0;
  }

  return   (asect->reloc_count + 1) * sizeof(arelent *);
}



/* ARGSUSED */
boolean
ecoff_slurp_reloc_table (abfd, asect)
     bfd *abfd;
     sec_ptr asect;
{
    abort();
}


/* This is stupid.  This function should be a boolean predicate */
unsigned int
ecoff_canonicalize_reloc (abfd, section, relptr)
     bfd *abfd;
     sec_ptr section;
     arelent **relptr;
{
    return 0;
}

boolean
ecoff_get_section_contents (abfd, section, location, offset, count)
     bfd *abfd;
     sec_ptr section;
     PTR location;
     file_ptr offset;
     int count;
{
  if (count) {
    if (offset >= section->size) return false;

    bfd_seek (abfd, section->filepos + offset, SEEK_SET);

    return (bfd_read (location, 1, count, abfd) == count) ? true:false;
  }
  else return true;
}

/* ARGSUSED */
alent *
ecoff_get_lineno(ignore_abfd, ignore_symbol)
bfd *ignore_abfd;
PTR ignore_symbol;
{
return (alent *)NULL;
}

#define ecoff_core_file_failing_command	_bfd_dummy_core_file_failing_command
#define	ecoff_core_file_failing_signal	_bfd_dummy_core_file_failing_signal
#define	ecoff_core_file_matches_executable_p	_bfd_dummy_core_file_matches_executable_p

/* Archives not supported yet.  FIXME.  */
#define	ecoff_slurp_armap		bfd_false
#define	ecoff_slurp_extended_name_table	bfd_false
#define	ecoff_truncate_arname		bfd_dont_truncate_arname
#define	ecoff_write_armap		bfd_false
#define	ecoff_openr_next_archived_file	bfd_generic_openr_next_archived_file
#define	ecoff_generic_stat_arch_elt	bfd_generic_stat_arch_elt

/* Unimplemented routines.  FIXME.  */
#define	ecoff_print_symbol		bfd_void
#define	ecoff_set_arch_mach		bfd_false
#define	ecoff_find_nearest_line		bfd_false
#define	ecoff_sizeof_headers		bfd_0

/* We use the generic BFD version of these.  */
#define	ecoff_close_and_cleanup		bfd_generic_close_and_cleanup

bfd_target ecoff_little_vec =
    {"ecoff-littlemips",      /* name */
	bfd_target_coff_flavour_enum,
	false,			/* data byte order is little */
	false,			/* header byte order is little */

	(HAS_RELOC | EXEC_P |	/* object flags */
	 HAS_LINENO | HAS_DEBUG |
	 HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT),

	(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* sect flags */
	'/',			/* ar_pad_char */
	15,			/* ar_max_namelen */
	_do_getllong, _do_putllong, _do_getlshort, _do_putlshort, /* data */
	_do_getllong, _do_putllong, _do_getlshort, _do_putlshort, /* hdrs */

	{_bfd_dummy_target, ecoff_object_p, /* bfd_check_format */
	  bfd_generic_archive_p, _bfd_dummy_target},
	{bfd_false, ecoff_mkobject, bfd_false, /* bfd_set_format */
	  bfd_false},
	{bfd_false, ecoff_write_object_contents, bfd_false, bfd_false},
	JUMP_TABLE (ecoff)
};

bfd_target ecoff_big_vec =
    {"ecoff-bigmips",      /* name */
	bfd_target_coff_flavour_enum,
	true,			/* data byte order is big */
	true,			/* header byte order is big */

	(HAS_RELOC | EXEC_P |	/* object flags */
	 HAS_LINENO | HAS_DEBUG |
	 HAS_SYMS | HAS_LOCALS | DYNAMIC | WP_TEXT),

	(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* sect flags */
	' ',			/* ar_pad_char */
	16,			/* ar_max_namelen */
	_do_getblong, _do_putblong, _do_getbshort, _do_putbshort, /* data */
	_do_getblong, _do_putblong, _do_getbshort, _do_putbshort, /* hdrs */

	{_bfd_dummy_target, ecoff_object_p, /* bfd_check_format */
	  bfd_generic_archive_p, _bfd_dummy_target},
	{bfd_false, ecoff_mkobject, bfd_false, /* bfd_set_format */
	  bfd_false},
	{bfd_false, ecoff_write_object_contents, /* bfd_write_contents */
	  bfd_false, bfd_false},
	JUMP_TABLE(ecoff)
};